opener

noun open·er \ˈōp-nər, ˈō-pə-\

: a tool, device, or machine that is used to open something

: the first game, performance, etc., in a series

Full Definition of OPENER

: one that opens <a bottle opener>: as

a plural : cards of sufficient value for a player to open the betting in a poker game

b : the first item, contest, or event of a series

— for openers

: to begin with

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15th century

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